Back-pressure valve



Jan. 3, 1928.

J. D. NIXON ET AL.

BACK PRESSURE VALVE 2 Sheets-Sheet 1 1, 0a.. BY W4 Filed Aug. 2, 1926 /JlT N fl a Jan. 3, 1928. 1,655,236

J. D. NIXON ET AL.

BACK PRESSURE VALVE Filed Aug. 2, 1926 2 Sheets-Sheet 2 Patented Jan. 3,1928.

UNITED STATES- PATENT OFFICE.

Baox-rnnssunn VALVE.

Application filed August 2, 1926. Serial No. 126,452.

This invention relates to new and useful improvements in a back pressurevalve.

One object of the invention is to provide a valve of the characterdescribed, adapted to be mounted in a set shoe and specially designed tobe associated with a wash pipe,

' vide a valve of, the character described of such construction that itwill not become readily worn away and caused to leak by the gritty fluidto which it issubjected.

A further feature of the invention is to provide a back pressure valvewhose casing is provided with means for anchoring the casing during themanipulation of the valve.

With the above and other objects in view this invention has particularrelation to certion novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawings,

wherein Figure 1 shows a vertical sectional view showing the valve inposition for washing the outside of the screen.

Figure 2 shows a cross sectional view taken on the line 22 of Figure 1.

Figure 3 shows a cross sectional view taken on the line 33 of Figure 1.

Figure 4 shows a side elevation of the valve in position for washing theinside of the screen and shown partly in section, and

Figure 5 shows a bgttom end view of the device. e I

Referrlng now'more particularlyto the drawings, wherein like numerals ofr'eference designate similar parts in each of the figures the numeral 1designates a screen, adapted to be set in a well bore. Attached to thelower end of this screen is a tubular set shoe 2, the lower end of whichcarries the-tubularide point 3, said shoe and guide point orming a.valve casing. Th e\ lower end of this guide point is contracted andprovided with a' restricted discharge port 4, and said contracted endhas the radiating fins 5 adapted to engage the formation at the bottomof the bore to anchor said valve casing against turning for a purpose tobe hereinafter explained The upper end of the guide point has theconventional, downwardly opening back pressure valve 6, therein.

Threaded into the upper end ofthe set shoe 2 there is an-annular anchor7 having a central tapped-hole 8 whose lower end is flared forming asmooth seat 9, and threaded through this anchor there is a tubular valve10 whose shank is externally threaded. The lower end of the valve 10 isclosed by a cap 11 whose upper end is beveled, as at 12, and thusconformed to the contour of and adapted to seat against the seat 9.

The upper end of the valve has an external annular shoulder 13, adaptedto abut against the anchor 7 and above said shoulder the valve 10 has asocket 14, polygonal in cross section, and whose upper end is flared, asat 15. The shank ofsaid valve lO'has the radial ports 16 intermediateits ends. i

In operation, when the screen 1 is set in the bore and it is desired towash the same a wash pipe 17 is lowered and its lower end 18 polygonalin cross section is seated in the socket 14, as shown in Figure 4. If iti i be desired to wash the outside of the screen the wash pipe 17 may beturned to screw the valve 10 downwardly through the anchor 7 so that thedischarge ports 16 will be beneath said anchor, as shown in Figure 1.Water may now be forced, under pressure, down through the wash pipe andout through said ports 16 and it will lift the valve 6 and pass out atthe port 4 and up around the outside of the screen. If it be desired towash the inside of the screen the valve 10 may be screwed upwardly bythe Wash pipe, through said anchor 7 to carry the ports 16 above theanchor and to seat the upper end of the cap 11 against the seat 9, asshown in Figure 4. Water under pressure, may now be forced down throughsaid wash pipe and out. through the ports 16 and up inside of thescreen. The fins 5 will anchor the valve last mentioned position, asshown in Figure 4, and thus effectivelyprevents oil or foreign matterfrom entering the lower end of partition. therein forming an anchor, atubular valve having a discharge port and threaded through-said anchorso that said port may be shifted from one to the other side of saidpartition.

25A device of the character described including-a tubular set-shoe,forming a valve casing, an anchor therein, a tubular valve secured tosaid anchor and having an inlet fluid conduit and a discharge port,operative connections between the anchor and valve whereby the valve maybe adjusted to permittli'e discharge of-fluid through said port oneither side'of the anchor.

3. A device of the character described ineluding a tubular set shoe,forming a yalve casing, a partition therein, a tubular valve having aninlet fluid conduit and a discharge port, operative connections betweenthe.'partition and valve whereby the valve may be adjusted-to permit thedischarge of fluid through said ,port on either side of the partition,..spaced abutments on said valve adapted to alternatively abut against andform a closefitting joint with said partition.

4. A device of the character described including a tubular set shoe,adapted to be attached to a well screen, a transverse partition therein,forming an anchor, a tubular valve whose lowerend is closed and whoseupper end has a water channel therethrough which terminates in a lateraldischarge port, said valve being threaded through said anchor, to permitthe adjustment of the valve t 'carry-said port above or beneath saidanchor;

5. A device of the character described including a tubular set shoe,adapted to be attached'to a well screen, a transverse partition'therein,forming ananchor, a tubular valve whose lower end is closed and whose'upper end has a water channel downwardly ftherethrough which terminatesin a lateral discharge port, said valve being threaded through saidanchorfor'ming an adjustable connection to permit said port to beadjusted intoposition above or beneath the';an'c hor, an annularoutsideabutment on said valve beneath said said anchor. 4

6. The combination with a tubular set port adapted to abut againstshoeha'ving a transverse partition therein,

forming an anchor, of a tubular valve threaded through said anchor andhaving a channel leading downwardly therethrough and terminating in alateral discharge port,

a wash pipe whose lower end is operatively connected with but detachablefrom theupper end of said valve through which said valve may be adjustedrelative to said anchor to locate said port on either side thereof.

7. In a device of the character described an anchor, a valve threadedthrough the anchor, said valve having a channel leading through thevalve from one end and terminating in a lateral port, spaced abutmentson said valve adapted to alternatively abut against and form a closefitting joint with said anchor.

8. In a device of the character described, an anchor, a valve threadedthrough the anchor, said valve having a channel leading through thevalve from one end and terminating in a lateral port, said valve beingad justable relative to the anchor to locate said port on either side ofthe anchor.

, 9. The combination with a well screen, of 8 a set shoe attached to thelower end thereof, a wash pipe within the screen and means through whichfluid conducted downwardly through the wash pipe may be returned upinside and outside of said screen alternatively, said means including ananchor, a valve threaded through said anchor and hav ing a channelleading through the valve from one end and terminating in a lateralport, the lower end of the wash pipe and the upper end of the valvebeing formed to permit their operative connection whereby the valve maybe adjusted, from said pipe, to locate said port on either side of theanchor.

In testimony whereof we have signed our names to this specification.

JEDDY D. NI XoN. "MARGIA MANNING.

